Yamaha YZ250 2022, Owner'S Service Manual

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TUNING
ENGINE
...........................................................................................................10-1
CARBURETOR SETTING ........................................................................10-1
ATMOSPHERIC CONDITIONS AND CARBURETOR SETTINGS ..........10-1
TEST RUN................................................................................................10-1
EFFECTS OF THE SETTING PARTS ON THE THROTTLE VALVE
OPENING ................................................................................................10-2
MAIN JET ADJUSTMENT ........................................................................10-2
ADJUSTING THE POWER JET ...............................................................10-2
PILOT AIR SCREW ADJUSTMENT.........................................................10-2
PILOT JET ADJUSTMENT.......................................................................10-3
JET NEEDLE ADJUSTMENT...................................................................10-3
JET NEEDLE GROOVE POSITION ADJUSTMENT ................................10-4
RELATIONSHIP WITH THROTTLE OPENING........................................10-4
CARBURETOR SETTING PARTS ...........................................................10-5
ROAD CONDITION AND EXAMPLES OF CARBURETOR SETTING.....10-7
EXAMPLES OF CARBURETOR SETTING DEPENDING ON
SYMPTOM...............................................................................................10-7
CHANGE OF THE HEAT RANGE OF SPARK PLUGS............................10-9
CHASSIS
......................................................................................................10-10
SELECTION OF THE SECONDARY REDUCTION RATIO
(SPROCKET).........................................................................................10-10
DRIVE AND REAR WHEEL SPROCKETS SETTING PARTS...............10-10
TIRE PRESSURE...................................................................................10-10
FRONT FORK SETTING........................................................................10-11
CHANGE IN AMOUNT AND CHARACTERISTICS OF FORK OIL ........10-11
SETTING OF SPRING AFTER REPLACEMENT...................................10-11
FRONT FORK SETTING PARTS...........................................................10-12
REAR SUSPENSION SETTING.............................................................10-12
CHOOSING SET LENGTH.....................................................................10-12
SETTING OF SPRING AFTER REPLACEMENT...................................10-13
REAR SHOCK ABSORBER SETTING PARTS .....................................10-13
SUSPENSION SETTING (FRONT FORK).............................................10-15
SUSPENSION SETTING (REAR SHOCK ABSORBER)........................10-16